Alert archive / Wyoming / Special Weather Statements in 2020
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Aug 4, 2020, 9:28 PM MDT for Albany County, Platte County, Wyoming. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2020, 9:28 PM MDT (03:28 UTC)
- Expired
- Aug 4, 2020, 10:15 PM MDT
- In force
- 47 min
- Issued by
- NWS Cheyenne, WY
Counties Albany County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 100 km from the middle of the area, began a volume at 03:32 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 3.5 hours before the alert went out and 293 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 717 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 2906 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.5
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before this special weather statement went out at Aug 4, 8:57 PM MDT, 31 minutes earlier.
Area forecast discussion, Aug 4, 8:57 PM MDT, 31 minutes before
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</html>Hazardous weather outlook, Aug 4, 4:40 AM MDT, 16 hours 48 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 440 AM MDT Tue Aug 4 2020 WYZ104-109>114-051045- Ferris/Seminoe/Shirley Mountains-Central Carbon County- North Snowy Range Foothills-Southwest Carbon County- Sierra Madre Range-Upper North Platte River Basin-Snowy Range- 440 AM MDT Tue Aug 4 2020 This hazardous weather outlook is for portions of south central Wyoming. .DAY ONE...TODAY AND TONIGHT Isolated to widely scattered afternoon and early evening thunderstorms will develop. Storms may produce strong, gusty winds and dry lightning. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Decreasing thunderstorm potential day by day as the area dries out under the influence of a ridge. Fire weather conditions will be the concern. .Spotter information statement... Spotter activation will not be required. NEZ002-003-019>021-054-055-095-096-WYZ101>103-105>108-115>119- 051045- Dawes-Box Butte-Scotts Bluff County-Banner County-Morrill- Kimball County-Cheyenne-North Sioux-South Sioux- Converse County Lower Elevations-Niobrara County- North Laramie Range-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-Laramie Valley- South Laramie Range-South Laramie Range Foothills- Central Laramie County-East Laramie County- 440 AM MDT Tue Aug 4 2020 This hazardous weather outlook is for portions of panhandle Nebraska...western Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Widely scattered thunderstorms will develop over the Laramie Range around noon and move eastward into the High Plains by mid-afternoon, reaching the western Nebraska Panhandle by late afternoon. Severe storms capable of producing large hail and strong gusty winds are possible. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Scattered afternoon and evening thunderstorms will develop through Thursday, becoming more isolated and confined to the mountains Friday and Saturday. Strong to severe thunderstorms producing large hail and strong gusty winds will be possible along and east of the Interstate 25 corridor Wednesday; an isolated tornado cannot be ruled out. .Spotter information statement... Spotter activation may be needed this afternoon and Wednesday afternoon along and east of the I-25 corridor.
In the hours before
Special weather statement, Aug 4, 6:34 PM MDT, 2 hours 54 minutes before
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</html>Special weather statement, Aug 4, 9:28 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
928 PM MDT Tue Aug 4 2020
WYZ101-103-105>107-110-115>118-050415-
East Platte County WY-Shirley Basin WY-South Laramie Range WY-
Central Laramie Range and Southwest Platte County WY-
Converse County Lower Elevations WY-Central Laramie County WY-
North Snowy Range Foothills WY-North Laramie Range WY-
South Laramie Range Foothills WY-Laramie Valley WY-
928 PM MDT Tue Aug 4 2020
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ALBANY...
NORTHWESTERN LARAMIE...WESTERN PLATTE AND SOUTH CENTRAL CONVERSE
COUNTIES UNTIL 1015 PM MDT...
At 928 PM MDT, trained weather spotters reported strong thunderstorms
along a line extending from near Curtis Gulch Campground to near
Bosler. Movement was east at 50 mph.
Penny size hail and wind gusts up to 50 mph will be possible with
these storms.
Strong thunderstorms will be near...
Baldy Peak around 935 PM MDT.
Laramie Peak around 945 PM MDT.
Iron Mountain, Esterbrook and Esterbrook Campground around 950 PM
MDT.
Harris Park around 955 PM MDT.
This includes Interstate 25 in Wyoming between mile markers 68 and
104.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4164 10594 4243 10593 4247 10537 4239 10500
4190 10490 4142 10492 4150 10532
TIME...MOT...LOC 0328Z 277DEG 44KT 4240 10573 4156 10559
TrudelThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 6:17 PM MDT | Special Weather Statement | CYS | Albany | 43 min |
| Aug 4, 6:34 PM MDT | Special Weather Statement | CYS | 41 min | |
| Aug 4, 7:00 PM MDT | Special Weather Statement | CYS | Albany | 45 min |
| Aug 4, 7:42 PM MDT | Special Weather Statement | CYS | 33 min | |
| Aug 4, 7:59 PM MDT | Special Weather Statement | CYS | Carbon | 46 min |
| Aug 4, 8:45 PM MDT | Special Weather Statement | CYS | Albany | 45 min |
| Aug 4, 10:50 PM MDT | Special Weather Statement | CYS | Goshen, Laramie, Platte | 40 min |
| Aug 4, 11:31 PM MDT | Special Weather Statement | CYS | Goshen | 44 min |
| Aug 5, 12:21 AM MDT | Special Weather Statement | CYS | Laramie | 24 min |
| Aug 5, 2:50 AM MDT | Red Flag Warning | CYS | 41 hr | |
| Aug 5, 1:23 PM MDT | Special Weather Statement | CYS | Laramie | 52 min |
| Aug 5, 1:59 PM MDT | Special Weather Statement | CYS | Laramie | 46 min |
| Aug 5, 2:05 PM MDT | Special Weather Statement | CYS | Converse | 40 min |
| Aug 5, 2:27 PM MDT | Special Weather Statement | CYS | Laramie | 48 min |
| Aug 5, 2:34 PM MDT | Fire Weather Watch | CYS | 13 hr | |
| Aug 5, 2:45 PM MDT | Special Weather Statement | CYS | Platte | 45 min |
| Aug 5, 2:53 PM MDT | Special Weather Statement | CYS | Platte | 52 min |
| Aug 5, 3:03 PM MDT | Special Weather Statement | CYS | 42 min | |
| Aug 5, 3:16 PM MDT | Special Weather Statement | CYS | Laramie | 44 min |
| Aug 5, 3:42 PM MDT | Special Weather Statement | CYS | Albany | 48 min |
| Aug 5, 3:57 PM MDT | Special Weather Statement | CYS | Converse | 48 min |
| Aug 5, 4:07 PM MDT | Special Weather Statement | CYS | Platte | 38 min |
| Aug 5, 4:22 PM MDT | Special Weather Statement | CYS | Converse | 38 min |
| Aug 5, 4:34 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 28 min |
| Aug 5, 4:50 PM MDT | Special Weather Statement | CYS | Converse | 40 min |
| Aug 5, 4:52 PM MDT | Special Weather Statement | CYS | Laramie | 38 min |
| Aug 5, 4:58 PM MDT | Special Weather Statement | CYS | Platte | 47 min |
| Aug 5, 5:01 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 44 min |
| Aug 5, 5:19 PM MDT | Special Weather Statement | CYS | Converse | 41 min |
| Aug 5, 5:21 PM MDT | Special Weather Statement | CYS | Goshen | 39 min |
| Aug 5, 5:34 PM MDT | Special Weather Statement | CYS | Platte | 41 min |
| Aug 5, 5:41 PM MDT | Special Weather Statement | CYS | Niobrara | 49 min |
| Aug 5, 12:15 AM MDT | Special Weather Statement | CYS | Banner, Kimball | 60 min |
| Aug 5, 3:50 PM MDT | Special Weather Statement | CYS | Box Butte | 40 min |
| Aug 5, 3:59 PM MDT | Special Weather Statement | CYS | Sioux | 46 min |
| Aug 5, 4:32 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 43 min |
| Aug 5, 4:55 PM MDT | Special Weather Statement | CYS | Sioux | 50 min |
| Aug 5, 5:31 PM MDT | Special Weather Statement | CYS | Morrill | 44 min |
Nearby
Special Weather Statements in Wyoming, 2020Every special weather statement in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.